JP2021050748A

JP2021050748A - Pipe joint and pipe removal method

Info

Publication number: JP2021050748A
Application number: JP2019172382A
Authority: JP
Inventors: 遼壱崎; Ryo Ichisaki; 猪谷　崇明; Takaaki Itani; 崇明猪谷
Original assignee: Hitachi Metals Ltd
Current assignee: Proterial Ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2021-04-01
Anticipated expiration: 2039-09-23
Also published as: JP7400288B2

Abstract

To provide a pipe joint which is capable of preventing removal of a pipe and from which the pipe is easy to be removed when a pipe circumference is a narrow space, and a removal method of the pipe in a single operation pipe joint.SOLUTION: A pipe joint 1 is provided with a nearly cylindrical housing 2 incorporating a seal ring 3 where a pipe is inserted from at least one end part and which is in close contact with an outer peripheral surface of the pipe. In the housing 2, a holding member 4 which holds an anti-loosening member 5 to be engaged with the pipe's outer peripheral surface in an insertion direction of the pipe from one end part and an elastic member 6 energizing the holding member 4 and the anti-loosening member 5 in the anti-insertion direction are arranged. Outside in the radial direction of the holding member 4, a through hole 24 going through an inside and an outside of the housing 2 is formed. In the state that the holding member is connected to the pipe, the holding member 4 and the anti-loosening member 5 move against an energizing force of the elastic member 6, and engagement between the anti-loosening member 5 and the pipe is released by the holding member 4 being pressed in the insertion direction from outside the radial direction via the through hole 24.SELECTED DRAWING: Figure 1

Description

本発明は、管が接続される管継手、および管の取り外し方法に関する。 The present invention relates to a pipe joint to which a pipe is connected and a method for removing the pipe.

給水または給湯用配管に使用される管としては、ステンレス鋼管に代表される耐食性に優れた薄肉鋼管が多用されている。このような管同士の接続には、管継手が用いられており、管継手に管の端部が挿入されることで接続される。近年では、工具を必要とせずに、管継手に管を差し込むだけで施工が完了できる、ワンタッチ式の管継手も実用化されている。 As pipes used for water supply or hot water supply pipes, thin-walled steel pipes having excellent corrosion resistance represented by stainless steel pipes are often used. A pipe joint is used to connect such pipes to each other, and the pipes are connected by inserting the end portion of the pipe into the pipe joint. In recent years, one-touch type pipe joints, which can be completed by simply inserting a pipe into the pipe joint without the need for tools, have also been put into practical use.

例えば、特許文献１に記載されているワンタッチ式の管継手は、基体の大径部の内面に設けられた２条の周溝にＯリングを嵌め込み、大径部の縁端にコイルバネと、内側面にエッジ部を有する抜止部材が嵌め込まれた合成樹脂製の内カラーとが配置され、これらをテーパ付外カラーで覆うようにした構造を有する。この管継手によれば、内カラーの先端より管が挿入されると、抜止部材が内カラーの先端側に押されるが、抜止部材の外側面が外カラーのテーパ面で押圧されて内側面のエッジ部が管に食い込むことにより、管継手と管との接続が保持される。この接続状態で管に引き抜き力が作用すると、抜止部材はコイルバネの付勢力により外カラーのテーパ面側に押し付けられるとともに、そのテーパ面によって抜止部材のエッジ部が管を押圧することにより、管の引き抜きが阻止される。これにより、ワンタッチでの管の接続を容易にしながらも、管の抜け出しの防止を図っている。 For example, in the one-touch type pipe joint described in Patent Document 1, an O-ring is fitted into two peripheral grooves provided on the inner surface of the large-diameter portion of the substrate, and a coil spring is formed at the edge of the large-diameter portion. It has a structure in which an inner collar made of synthetic resin in which a retaining member having an edge portion is fitted is arranged on the side surface, and these are covered with a tapered outer collar. According to this pipe joint, when a pipe is inserted from the tip of the inner collar, the retaining member is pushed toward the tip of the inner collar, but the outer surface of the retaining member is pressed by the tapered surface of the outer collar to form the inner surface. The connection between the pipe joint and the pipe is maintained by the edge portion biting into the pipe. When a pulling force acts on the pipe in this connected state, the retaining member is pressed against the tapered surface side of the outer collar by the urging force of the coil spring, and the edge portion of the retaining member presses the pipe by the tapered surface, so that the pipe is pressed. Pulling out is blocked. This facilitates one-touch connection of the pipe and prevents the pipe from coming off.

特開平１０−１２２４６０号公報Japanese Unexamined Patent Publication No. 10-12246

ところで、配管のメンテナンス時や交換時などには、管を管継手から取り外す必要がある場合がある。例えば、特許文献１の管継手では、接続状態において、内カラーの先端をコイルバネの付勢力に抗して押すことにより、抜止部材と外カラーの接触が解かれ、管を取り外すことができる。しかし、この取り外しの作業は、ドライバーなどの工具を管の軸方向へ沿って作用させ、内カラーを管の挿入方向に押し込む必要がある。そのため、作業時に管周囲が狭い空間などの場合には、管の取り外しが困難になるおそれがある。 By the way, it may be necessary to remove the pipe from the pipe joint at the time of maintenance or replacement of the pipe. For example, in the pipe joint of Patent Document 1, by pushing the tip of the inner collar against the urging force of the coil spring in the connected state, the contact between the retaining member and the outer collar is released, and the pipe can be removed. However, this removal work requires a tool such as a screwdriver to act along the axial direction of the pipe and push the inner collar in the insertion direction of the pipe. Therefore, it may be difficult to remove the pipe when the space around the pipe is narrow during work.

本発明は、上記事情に鑑みてなされたものであり、ワンタッチ式の管継手において、管周囲が狭い空間などの場合でも管の抜け出しを防止できるとともに、管を容易に取り外すことが可能な管継手および管の取り外し方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and in a one-touch type pipe joint, it is possible to prevent the pipe from coming off even in a space where the circumference of the pipe is narrow, and the pipe can be easily removed. And to provide a method of removing the tube.

本発明の管継手は、少なくとも一端部から管が挿入され、上記管の外周面に密着するシール部材が内蔵された略円筒状のハウジングを備え、上記ハウジング内において、上記一端部から上記管の挿入方向へ向かって、上記管の外周面に係合される抜止部材を保持する保持部材と、上記保持部材および上記抜止部材を反挿入方向へ向かって付勢する弾性部材とが配置された管継手であって、上記保持部材の径方向外側に上記ハウジングの内外を径方向に貫通する貫通孔が形成されており、上記管と接続された状態において、上記貫通孔を介して上記保持部材が径方向外側から挿入方向に押圧されることで、上記保持部材および上記抜止部材が上記弾性部材の付勢力に抗して移動して、上記抜止部材と上記管の係合が解除されることを特徴とするものである。 The pipe joint of the present invention includes a substantially cylindrical housing in which a pipe is inserted from at least one end and a sealing member that is in close contact with the outer peripheral surface of the pipe is incorporated. A pipe in which a holding member for holding a retaining member engaged with the outer peripheral surface of the pipe in the insertion direction and an elastic member for urging the holding member and the retaining member in the anti-insertion direction are arranged. In the joint, a through hole that radially penetrates the inside and outside of the housing is formed on the radial outer side of the holding member, and in a state of being connected to the pipe, the holding member passes through the through hole. By being pressed from the outside in the radial direction in the insertion direction, the holding member and the retaining member move against the urging force of the elastic member, and the engagement between the retaining member and the pipe is released. It is a feature.

本発明において、抜止部材と管の係合が解除されるとは、抜止部材と管の係合が完全に解除された状態だけでなく、管を引き抜くことが可能な程度に係合が緩められた状態も含む。また、本発明における「保持部材が挿入方向に押圧される」には、保持部材が挿入方向成分を含む斜め方向に押圧される場合も含まれる。 In the present invention, when the retaining member and the pipe are disengaged, not only the engagement between the retaining member and the pipe is completely disengaged, but also the engagement is loosened to the extent that the pipe can be pulled out. Including the state of Further, "the holding member is pressed in the insertion direction" in the present invention includes the case where the holding member is pressed in the oblique direction including the insertion direction component.

また、本発明の管継手において、上記保持部材は略リング状部材であり、上記貫通孔は、上記保持部材の径方向外側であって、かつ、上記ハウジングの周方向に間隔をあけて複数個形成されている。 Further, in the pipe joint of the present invention, the holding member is a substantially ring-shaped member, and a plurality of through holes are provided outside the holding member in the radial direction and at intervals in the circumferential direction of the housing. It is formed.

また、本発明の管継手において、上記ハウジングは、上記シール部材が内蔵されたハウジング本体と、該ハウジング本体の一端部に装着されたナット状部材とで構成され、上記ナット状部材に上記貫通孔が形成され、該貫通孔の内側に上記保持部材が設けられており、上記保持部材と上記ハウジング本体との間に上記弾性部材が配置されている。 Further, in the pipe joint of the present invention, the housing is composed of a housing body in which the sealing member is built and a nut-shaped member mounted on one end of the housing body, and the nut-shaped member has a through hole. Is formed, the holding member is provided inside the through hole, and the elastic member is arranged between the holding member and the housing body.

また、本発明の管継手において、上記ナット状部材は、上記ハウジング本体に対して上記挿入方向にスライド可能に装着されており、上記ナット状部材を上記挿入方向にスライドさせることで、上記弾性部材が圧縮され、上記保持部材の移動が制限される。 Further, in the pipe joint of the present invention, the nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member Is compressed, and the movement of the holding member is restricted.

また、本発明の管継手において、上記管継手は、上記保持部材を押圧するための押圧治具をさらに備え、上記押圧治具は、周方向の一部に切欠部を有する略リング状部材であり、その内周面に、上記貫通孔に挿通可能な突起が形成されている。 Further, in the pipe joint of the present invention, the pipe joint further includes a pressing jig for pressing the holding member, and the pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction. There is, and a protrusion that can be inserted into the through hole is formed on the inner peripheral surface thereof.

また、本発明の管継手において、上記押圧治具の上記突起は、軸方向の一方向に向かって傾斜した傾斜面を有しており、上記傾斜面が上記保持部材に当接されて押圧される。 Further, in the pipe joint of the present invention, the protrusion of the pressing jig has an inclined surface inclined in one direction in the axial direction, and the inclined surface is brought into contact with the holding member and pressed. To.

本発明の管の取り外し方法は、押圧治具を用いて、管継手から管を取り外す管の取り外し方法であって、上記管継手は、少なくとも一端部から管が挿入され、上記管の外周面に密着するシール部材が内蔵された略円筒状のハウジングを備え、上記ハウジング内において、上記一端部から上記管の挿入方向へ向かって、上記管の外周面に係合される抜止部材を保持する保持部材と、上記保持部材および上記抜止部材を反挿入方向へ向かって付勢する弾性部材とが配置され、上記保持部材の径方向外側に上記ハウジングの内外を径方向に貫通する貫通孔が形成されており、上記押圧治具は、周方向の一部に切欠部を有する略リング状部材であり、その内周面に、上記貫通孔に挿通可能な突起が形成されており、上記管の取り外し方法は、上記管継手と上記管とが接続された状態において、上記押圧治具を拡径させて、上記突起が上記ハウジングの貫通孔に嵌合するように上記押圧治具を装着する装着工程と、装着された上記押圧治具の上記突起を径方向内側に押圧して、上記保持部材および上記抜止部材を上記弾性部材の付勢力に抗して移動させる押圧工程と、上記押圧工程によって上記抜止部材との係合が解除された上記管を引き抜く引き抜き工程を有することを特徴とするものである。 The method for removing a pipe of the present invention is a method for removing a pipe from a pipe joint using a pressing jig. The pipe is inserted from at least one end of the pipe joint and is inserted into the outer peripheral surface of the pipe. A holding having a substantially cylindrical housing in which a sealing member to be brought into close contact is provided, and holding a retaining member engaged with an outer peripheral surface of the pipe from one end of the housing toward the insertion direction of the pipe. A member, an elastic member for urging the holding member and the retaining member in the anti-insertion direction are arranged, and a through hole penetrating the inside and outside of the housing is formed on the radial outside of the holding member. The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a protrusion that can be inserted into the through hole is formed on the inner peripheral surface thereof, and the pipe can be removed. The method is a mounting step of expanding the diameter of the pressing jig in a state where the pipe joint and the pipe are connected, and mounting the pressing jig so that the protrusion fits into the through hole of the housing. By the pressing step of pressing the protrusion of the mounted pressing jig inward in the radial direction to move the holding member and the retaining member against the urging force of the elastic member, and the pressing step. It is characterized by having a pulling-out step of pulling out the pipe which has been disengaged from the pulling-out member.

本発明の管継手は、ハウジング内において、保持部材および抜止部材が反挿入方向へ向かって付勢されており、付勢された抜止部材が管の外周面に係合されるので管の抜け出しを防止することができる。また、保持部材の径方向外側にハウジングの内外を径方向に貫通する貫通孔が形成されており、管と接続された状態において、貫通孔を介して保持部材が径方向外側から挿入方向に押圧されることで、保持部材および抜止部材が弾性部材の付勢力に抗して移動して、抜止部材と管の係合が解除されるので、管周囲が狭い空間などの場合でも管を容易に取り外すことができる。 In the pipe joint of the present invention, the holding member and the retaining member are urged in the anti-insertion direction in the housing, and the urged retaining member is engaged with the outer peripheral surface of the pipe to prevent the pipe from coming out. Can be prevented. Further, a through hole is formed on the radial outside of the holding member to penetrate the inside and outside of the housing in the radial direction, and the holding member is pressed in the insertion direction from the radial outside through the through hole in a state of being connected to the pipe. By doing so, the holding member and the retaining member move against the urging force of the elastic member, and the engagement between the retaining member and the pipe is released, so that the pipe can be easily connected even in a narrow space around the pipe. Can be removed.

上記保持部材は略リング状部材であり、貫通孔は、保持部材の径方向外側であって、かつ、ハウジングの周方向に間隔をあけて複数個形成されていることで、複数の貫通孔を介して保持部材を径方向から均一に押圧できるので、保持部材の移動をスムーズに行いやすい。 The holding member is a substantially ring-shaped member, and a plurality of through holes are formed on the outer side in the radial direction of the holding member and at intervals in the circumferential direction of the housing, so that a plurality of through holes can be formed. Since the holding member can be uniformly pressed from the radial direction through the holding member, the holding member can be easily moved smoothly.

上記ハウジングは、シール部材が内蔵されたハウジング本体と、ナット状部材とで構成され、ナット状部材に貫通孔が形成され、該貫通孔の内側に保持部材が設けられており、保持部材とハウジング本体との間に弾性部材が配置されているので、ハウジング内の各部材の設置や取り外しなどが行いやすい。 The housing is composed of a housing body having a built-in seal member and a nut-shaped member. A through hole is formed in the nut-shaped member, and a holding member is provided inside the through hole. The holding member and the housing are provided. Since the elastic member is arranged between the main body and the main body, it is easy to install and remove each member in the housing.

上記ナット状部材は、ハウジング本体に対して挿入方向にスライド可能に装着されており、ナット状部材を挿入方向にスライドさせることで、弾性部材が圧縮され、保持部材の移動が制限されるので、保持部材が押圧された場合であっても抜止部材と管の係合が維持される。そのため、誤操作などにより押圧部材が意図せずに押圧された場合であっても、管が抜けることを防止できる。 The nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed and the movement of the holding member is restricted. Even when the holding member is pressed, the engagement between the retaining member and the pipe is maintained. Therefore, even if the pressing member is unintentionally pressed due to an erroneous operation or the like, it is possible to prevent the pipe from coming off.

上記管継手は、保持部材を押圧するための押圧治具をさらに備え、押圧治具は、周方向の一部に切欠部を有する略リング状部材であり、その内周面に、貫通孔に挿通可能な突起が形成されており、その突起は、軸方向の一方向に向かって傾斜した傾斜面を有しており、傾斜面が保持部材に当接されて押圧されるので、保持部材が傾斜面に沿うことで、保持部材および抜止部材をスムーズに移動させやすくなり、抜止部材と管の係合を容易に解除することができる。 The pipe joint further includes a pressing jig for pressing the holding member, and the pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a through hole is formed in the inner peripheral surface thereof. An insertable protrusion is formed, and the protrusion has an inclined surface inclined in one direction in the axial direction, and the inclined surface is abutted against and pressed against the holding member, so that the holding member is pressed. Along the inclined surface, the holding member and the retaining member can be easily moved, and the engagement between the retaining member and the pipe can be easily disengaged.

本発明の管の取り外し方法は、内周面に突起が形成され、周方向の一部に切欠部を有する略リング状の押圧治具を用いた方法であり、その方法は、管継手と管とが接続された状態において、押圧治具を拡径させて、突起がハウジングの貫通孔に嵌合するように押圧治具を装着する装着工程と、装着された押圧治具の突起を径方向内側に押圧して、保持部材および抜止部材を弾性部材の付勢力に抗して移動させる押圧工程と、押圧工程によって抜止部材との係合が解除された管を引き抜く引き抜き工程を有するので、管周囲が狭い空間などの場合でも管を容易に取り外すことできる。 The method for removing the pipe of the present invention is a method using a substantially ring-shaped pressing jig having a protrusion formed on the inner peripheral surface and a notch in a part in the circumferential direction, and the method is a pipe joint and a pipe. The mounting process of expanding the diameter of the pressing jig and mounting the pressing jig so that the protrusion fits into the through hole of the housing, and the mounting process of mounting the protrusion of the mounted pressing jig in the radial direction. Since it has a pressing step of pressing inward to move the holding member and the retaining member against the urging force of the elastic member, and a pulling step of pulling out the tube whose engagement with the retaining member is released by the pressing step, the tube is provided. The pipe can be easily removed even in a narrow space.

本発明に係る管継手の第１実施形態の断面図である。It is sectional drawing of 1st Embodiment of the pipe fitting which concerns on this invention. 図１の保持部材の斜視図およびその一部拡大図である。It is a perspective view of the holding member of FIG. 1 and a partially enlarged view thereof. 図１の抜止部材の斜視図である。It is a perspective view of the retaining member of FIG. 管継手と管が接続された接続状態の断面図である。It is sectional drawing of the connection state in which a pipe joint and a pipe are connected. 管継手に装着される押圧治具の斜視図である。It is a perspective view of the pressing jig attached to a pipe joint. 押圧治具を管継手に装着した状態の断面図である。It is sectional drawing in the state which the pressing jig is attached to the pipe joint. 押圧治具で保持部材を押圧した状態の断面図である。It is sectional drawing in the state of pressing the holding member with a pressing jig. 本発明に係る管継手の第２実施形態の片側断面図である。It is one side sectional view of the 2nd Embodiment of the pipe fitting which concerns on this invention. 本発明に係る管継手の第３実施形態の片側断面図である。It is one side sectional view of the 3rd Embodiment of the pipe fitting which concerns on this invention. 図９のナット状部材をスライドさせた状態の片側断面図である。It is one side sectional view in the state where the nut-shaped member of FIG. 9 is slid. 図９のカラーの斜視図である。9 is a perspective view of the color of FIG.

本発明に係る管継手の第１実施形態を図１に基づいて説明する。図１に示すように、管継手１は、両端部が開口した略円筒状のハウジング２を備える。ハウジング２内には、管の外周面に係合される抜止部材５と、抜止部材５を保持する保持部材４と、弾性部材６と、シールリング３とが設置されている。図１の管継手１において、ハウジング２の一端側（図右側）の挿入口２３から管が挿入され、ハウジング２の他端側（図左側）には、他の管が接続される。また、管継手１は、保持部材４を押圧するための押圧治具（例えば図５参照）をさらに備える。 A first embodiment of a pipe joint according to the present invention will be described with reference to FIG. As shown in FIG. 1, the pipe joint 1 includes a substantially cylindrical housing 2 having both ends open. In the housing 2, a retaining member 5 that is engaged with the outer peripheral surface of the pipe, a holding member 4 that holds the retaining member 5, an elastic member 6, and a seal ring 3 are installed. In the pipe joint 1 of FIG. 1, a pipe is inserted from an insertion port 23 on one end side (right side in the drawing) of the housing 2, and another pipe is connected to the other end side (left side in the drawing) of the housing 2. Further, the pipe joint 1 further includes a pressing jig (for example, see FIG. 5) for pressing the holding member 4.

本発明において、ハウジング２の中心軸Ｏに沿う方向を軸方向といい、軸方向から見た平面視で中心軸Ｏと直交する方向を径方向といい、該平面視で中心軸Ｏ回りに周回する方向を周方向という。また、上記軸方向のうち、管継手に対して管を挿入する方向を挿入方向といい、挿入方向と反対の方向を反挿入方向という。 In the present invention, the direction along the central axis O of the housing 2 is referred to as an axial direction, and the direction orthogonal to the central axis O in a plan view from the axial direction is referred to as a radial direction, and orbits around the central axis O in the plan view. The direction of doing is called the circumferential direction. Further, among the above axial directions, the direction in which the pipe is inserted into the pipe joint is referred to as the insertion direction, and the direction opposite to the insertion direction is referred to as the anti-insertion direction.

ハウジング２は、ハウジング本体２１と、ハウジング本体２１内に装着されたスペーサ部材２２とを有する。ハウジング本体２１の内壁面には、シールリング３を保持するための円周溝２１１が形成されている。ハウジング２は、耐食性および剛性を必要とするので、例えばＳＣＳ材や青銅材の材料を用いて精密鋳造の手法により形成することができる。 The housing 2 has a housing main body 21 and a spacer member 22 mounted in the housing main body 21. A circumferential groove 211 for holding the seal ring 3 is formed on the inner wall surface of the housing body 21. Since the housing 2 requires corrosion resistance and rigidity, it can be formed by a precision casting method using, for example, an SCS material or a bronze material.

シールリング３は、弾性変形可能なゴム製リングである。ゴムの種類としては、エチレンとプロピレンと架橋用ジエンモノマーとの３元共重合体であるＥＰＤＭや、オレフィン系ゴム、四フッ化エチレン−パーフルオロメチルビニルエーテルゴム（ＦＦＫＭ）などのフッ素ゴムなどを使用できる。また、図１に示すように、シールリング３はリップ部３１を有することが好ましく、リップ部３１が管の外周面に密着する。これにより、所定の面圧が確保され、高いシール性が確保される。 The seal ring 3 is a rubber ring that can be elastically deformed. As the type of rubber, EPDM, which is a ternary copolymer of ethylene, propylene and a diene monomer for cross-linking, olefin rubber, fluororubber such as ethylene tetrafluoride-perfluoromethyl vinyl ether rubber (FFKM), etc. are used. it can. Further, as shown in FIG. 1, the seal ring 3 preferably has a lip portion 31, and the lip portion 31 is in close contact with the outer peripheral surface of the pipe. As a result, a predetermined surface pressure is secured and high sealing performance is ensured.

ハウジング２において、スペーサ部材２２の内周面は、反挿入方向へ進むにしたがって縮径する傾斜面２２１で形成されている。弾性部材６は、ハウジング本体２１の段部２１２と保持部材４との間に配置されている。弾性部材６が保持部材４および抜止部材５を反挿入方向へ向かって付勢することで、抜止部材５の外周面５１１がスペーサ部材２２の傾斜面２２１に当接する。なお、ハウジング本体２１の挿入口２３側の内周面には内周溝が設けられており、スペーサ部材２２が外方に抜け出すことを防止するため、該内周溝に止め輪７が嵌合されている。 In the housing 2, the inner peripheral surface of the spacer member 22 is formed of an inclined surface 221 whose diameter decreases as it advances in the counter-insertion direction. The elastic member 6 is arranged between the step portion 212 of the housing main body 21 and the holding member 4. When the elastic member 6 urges the holding member 4 and the retaining member 5 toward the counter-insertion direction, the outer peripheral surface 511 of the retaining member 5 comes into contact with the inclined surface 221 of the spacer member 22. An inner peripheral groove is provided on the inner peripheral surface of the housing body 21 on the insertion port 23 side, and a retaining ring 7 is fitted in the inner peripheral groove in order to prevent the spacer member 22 from coming out. Has been done.

弾性部材６としては、圧縮コイルバネなどを使用することができる。図１では、線材を一端から他端に向って外径が増大するように巻回された円錐台状のコイルバネを、大径側がハウジング本体２１の段部２１２に当接し、小径側が保持部材４に当接するように設けられている。 As the elastic member 6, a compression coil spring or the like can be used. In FIG. 1, a truncated cone-shaped coil spring in which a wire rod is wound so as to increase the outer diameter from one end to the other end is brought into contact with the step portion 212 of the housing body 21 on the large diameter side and the holding member 4 on the small diameter side. It is provided so as to come into contact with.

ハウジング２において、保持部材４の径方向外側にはハウジング２の内外を径方向に貫通する貫通孔２４が形成されている。この貫通孔２４を通じて、ハウジング２の内部に配置された保持部材４を目視することが可能である（例えば図８参照）。貫通孔２４は、ハウジング本体２１の周方向に間隔をあけて複数個形成されている。貫通孔２４の形状は、特に限定されるものではなく、矩形状や、円形状、楕円形状などの形状であってもよい。また、貫通孔２４の大きさは、内側に位置する保持部材４を押圧可能な大きさであればよく、例えば、後述する押圧治具の突起を挿通可能な大きさである。具体的には、ハウジング２１の周方向における貫通孔２４の最大長さは１０ｍｍ〜３０ｍｍ程度である。 In the housing 2, a through hole 24 is formed on the outside of the holding member 4 in the radial direction to penetrate the inside and outside of the housing 2 in the radial direction. Through the through hole 24, the holding member 4 arranged inside the housing 2 can be visually observed (see, for example, FIG. 8). A plurality of through holes 24 are formed at intervals in the circumferential direction of the housing main body 21. The shape of the through hole 24 is not particularly limited, and may be a rectangular shape, a circular shape, an elliptical shape, or the like. Further, the size of the through hole 24 may be a size that can press the holding member 4 located inside, and is, for example, a size that allows the protrusion of the pressing jig described later to be inserted. Specifically, the maximum length of the through hole 24 in the circumferential direction of the housing 21 is about 10 mm to 30 mm.

続いて、保持部材４による抜止部材５の保持について、図２および図３を用いて説明する。図２（ａ）は保持部材４の斜視図であり、図２（ｂ）はそのＡ部拡大図である。図２（ａ）に示すように、保持部材４は略リング状部材であり、一端に弾性部材の台座となる円環状のフランジ部４１が形成されており、他端に複数の保持片４２が形成されている。複数の保持片４２は、円周方向に沿って並設され、各保持片４２は略矩形状に切り込まれた保持溝４３によって分割されている。なお、後述するように、フランジ部４１には押圧治具の突起の傾斜面（図７参照）が当接される。そのため、該突起の傾斜面との当接を行いやすくするため、フランジ部４１の保持片４２側端面の角部を切り欠いて、上記突起の傾斜面に対応する傾斜面とすることが好ましい。 Subsequently, the holding of the retaining member 5 by the holding member 4 will be described with reference to FIGS. 2 and 3. FIG. 2A is a perspective view of the holding member 4, and FIG. 2B is an enlarged view of part A thereof. As shown in FIG. 2A, the holding member 4 is a substantially ring-shaped member, an annular flange portion 41 serving as a pedestal for an elastic member is formed at one end, and a plurality of holding pieces 42 are formed at the other end. It is formed. The plurality of holding pieces 42 are arranged side by side along the circumferential direction, and each holding piece 42 is divided by a holding groove 43 cut into a substantially rectangular shape. As will be described later, the inclined surface (see FIG. 7) of the protrusion of the pressing jig is brought into contact with the flange portion 41. Therefore, in order to facilitate contact with the inclined surface of the protrusion, it is preferable to cut out a corner portion of the end surface of the holding piece 42 side of the flange portion 41 to form an inclined surface corresponding to the inclined surface of the protrusion.

図２（ｂ）に示すように、保持片４２の両側面には保持溝４３内に突出する略三角形状の係止部４４が形成されている。この係止部４４に抜止部材が嵌め込まれる。また、各保持片４２の外周面には円周方向に沿った円周溝４２１が形成されており、この円周溝４２１と抜止部材を跨ぐように締結リング（図示省略）が装着される。なお、係止部４４は、抜止部材の保持部材４からの脱落を防止できる構成であればよく、保持片４２の一方の側面にのみ形成されていてもよい。 As shown in FIG. 2B, substantially triangular locking portions 44 projecting into the holding groove 43 are formed on both side surfaces of the holding piece 42. A retaining member is fitted into the locking portion 44. Further, a circumferential groove 421 is formed on the outer peripheral surface of each holding piece 42 along the circumferential direction, and a fastening ring (not shown) is mounted so as to straddle the circumferential groove 421 and the retaining member. The locking portion 44 may be formed only on one side surface of the holding piece 42 as long as it can prevent the retaining member from falling off from the holding member 4.

図３は、抜止部材５の斜視図である。図３に示すように、抜止部材５は、山形部５１と、その山形の下部に形成された挟着部５２とを有する。山形部５１と挟着部５２の間には段差が設けられており、図２に示した保持部材４の係止部４４に嵌め込まれるようにするため、挟着部５２の幅が山形部５１よりも狭くなっている。抜止部材５は、保持部材４の保持溝４３に差し込まれ、山形部５１と挟着部５２の間の段差で係止部４４に係止され、保持部材４の円周方向に沿って複数保持された状態で管継手に組込まれる。 FIG. 3 is a perspective view of the retaining member 5. As shown in FIG. 3, the retaining member 5 has a chevron portion 51 and a pinching portion 52 formed in a lower portion of the chevron portion 51. A step is provided between the chevron portion 51 and the sandwiching portion 52, and the width of the sandwiching portion 52 is set to the chevron portion 51 so that the holding member 4 is fitted into the locking portion 44 shown in FIG. Is narrower than. The retaining member 5 is inserted into the holding groove 43 of the holding member 4, is locked to the locking portion 44 by a step between the chevron portion 51 and the sandwiching portion 52, and holds a plurality of the retaining members 5 along the circumferential direction of the holding member 4. It is incorporated into the pipe joint in the state where it is installed.

また、図３の抜止部材５の内周面には、複数（図３では４個）のエッジ部５２１が形成されている。エッジ部５２１を設けることで、管が挿入された状態で、抜止部材５のエッジ部５２１が管の外周面に食い込みやすくなるため、引き抜きに対する阻止力を一層向上できる。なお、抜止部材は、保持部材４に保持され、かつ、管の外周面に係合できる形状であれば、図３の構成に限らない。例えば、挟着部５２の内周面が、管の拡管部に嵌装されるようにするため、エッジ部のない円弧状に形成されていてもよい。 Further, a plurality of (4 in FIG. 3) edge portions 521 are formed on the inner peripheral surface of the retaining member 5 in FIG. By providing the edge portion 521, the edge portion 521 of the retaining member 5 can easily bite into the outer peripheral surface of the pipe in the state where the pipe is inserted, so that the blocking force against pulling out can be further improved. The retaining member is not limited to the configuration shown in FIG. 3 as long as it is held by the holding member 4 and has a shape that can be engaged with the outer peripheral surface of the pipe. For example, the inner peripheral surface of the sandwiching portion 52 may be formed in an arc shape without an edge portion in order to be fitted to the expanding portion of the pipe.

次に、管継手と管の接続状態について図４を用いて説明する。図４において、管１１は、例えばＳＵＳ３０４製の鋼管であり、管端部に円弧状断面を有する拡管部１２が形成されている。管１１を、ハウジング２の挿入口２３から挿入していき、管１１の先端がハウジング本体２１に突き当たるまで挿入すると、拡管部１２は抜止部材５のエッジ部５２１に嵌まり合い、ワンタッチ操作で接続が完了する。図４の接続状態では、弾性部材６の付勢力によって、保持部材４および抜止部材５が反挿入方向に押されることで、抜止部材５の外周面５１１が傾斜面２２１に当接して、そのエッジ部５２１が拡管部１２の外周面に密接に係合する。この接続状態において、管１１に引き抜き力が作用しても、抜止部材５が管１１の外周面に食い込むことで管１１は抜かれない。一方で、配管のメンテナンス時や交換時などには、管１１を管継手１から取り外す必要がある場合がある。 Next, the connection state between the pipe joint and the pipe will be described with reference to FIG. In FIG. 4, the pipe 11 is, for example, a steel pipe made of SUS304, and a pipe expansion portion 12 having an arcuate cross section is formed at the pipe end portion. When the tube 11 is inserted from the insertion port 23 of the housing 2 and inserted until the tip of the tube 11 abuts on the housing body 21, the tube expanding portion 12 fits into the edge portion 521 of the retaining member 5 and is connected by a one-touch operation. Is completed. In the connected state of FIG. 4, the holding member 4 and the retaining member 5 are pushed in the anti-insertion direction by the urging force of the elastic member 6, so that the outer peripheral surface 511 of the retaining member 5 comes into contact with the inclined surface 221 and its edge. The portion 521 closely engages with the outer peripheral surface of the tube expansion portion 12. In this connected state, even if a pulling force acts on the pipe 11, the pipe 11 is not pulled out because the retaining member 5 bites into the outer peripheral surface of the pipe 11. On the other hand, it may be necessary to remove the pipe 11 from the pipe joint 1 at the time of maintenance or replacement of the pipe.

管の取り外し機構について、本発明に係る管継手１は、貫通孔２４を介して径方向外側から挿入方向に保持部材４が押圧されることで、保持部材４および抜止部材５が弾性部材６の付勢力に抗して移動して、抜止部材５と管１１の係合が解除されることを特徴としている。この構成によれば、保持部材４を径方向外側から挿入方向に押圧することにより抜止部材５の係合を解除できるため、管継手の軸方向に沿って工具を作用させる必要もなく、狭い空間などでの作業性に優れる。 Regarding the pipe removing mechanism, in the pipe joint 1 according to the present invention, the holding member 4 and the retaining member 5 are made of elastic members 6 by pressing the holding member 4 from the outside in the radial direction through the through hole 24 in the insertion direction. It is characterized in that it moves against the urging force and the engagement between the retaining member 5 and the pipe 11 is released. According to this configuration, since the retaining member 4 can be disengaged by pressing the holding member 4 from the radial outside in the insertion direction, it is not necessary to operate a tool along the axial direction of the pipe joint, and a narrow space is created. Excellent workability in such cases.

保持部材４を押圧するための手段として、例えば押圧治具が用いられる。押圧治具としては、貫通孔を介して保持部材の径方向外側から作用させることができ保持部材を挿入方向に押圧できるものであれば、使用可能である。例えば、ドライバーなどの工具や所定の形状をした治具などが使用可能である。押圧治具は、管継手を構成する部材として管継手１に予め備えられていてもよい。押圧治具が具備される形態として、例えば、管継手の所定箇所に押圧治具が保持される形態や、管継手に押圧治具が同梱される形態を含む。図５には、押圧治具の一例を示す。図５に示すように、押圧治具８は、周方向の一部に切欠部８３を有する略リング状部材である。リング本体８１の内周面には、径方向内側に向かって突出した突起８２が設けられている。図５では、４個の突起８２がリング周方向に等間隔に設けられている。 As a means for pressing the holding member 4, for example, a pressing jig is used. As the pressing jig, any jig that can act from the radial outside of the holding member through the through hole and can press the holding member in the insertion direction can be used. For example, a tool such as a screwdriver or a jig having a predetermined shape can be used. The pressing jig may be provided in the pipe joint 1 in advance as a member constituting the pipe joint. Examples of the form in which the pressing jig is provided include, for example, a form in which the pressing jig is held at a predetermined position of the pipe joint and a form in which the pressing jig is bundled with the pipe joint. FIG. 5 shows an example of a pressing jig. As shown in FIG. 5, the pressing jig 8 is a substantially ring-shaped member having a notch 83 in a part in the circumferential direction. A protrusion 82 projecting inward in the radial direction is provided on the inner peripheral surface of the ring body 81. In FIG. 5, four protrusions 82 are provided at equal intervals in the circumferential direction of the ring.

押圧治具は、図５の例に限定されるものではない。例えば、突起の数は、４個に限定されず、１個や、２個、５個以上であってもよい。また、突起が複数個の場合、リング周方向における各突起の間隔が互いに異なるようにしてもよい。また、図５の例では、リング本体８１の内周面の領域において各突起が均等に配置されているが、各突起が偏在（例えば、切欠部の対向位置側にのみ配置）されていてもよい。また、押圧治具を半円リング形状にしてもよい。 The pressing jig is not limited to the example of FIG. For example, the number of protrusions is not limited to four, and may be one, two, five or more. Further, when there are a plurality of protrusions, the distance between the protrusions in the ring circumferential direction may be different from each other. Further, in the example of FIG. 5, the protrusions are evenly arranged in the region of the inner peripheral surface of the ring body 81, but even if the protrusions are unevenly distributed (for example, arranged only on the opposite position side of the notch portion). Good. Further, the pressing jig may have a semicircular ring shape.

図５において、各突起８２は、軸方向断面の形状が非対称である。具体的には、軸方向の一方向に向かって傾斜した傾斜面８２１を有する。この傾斜面８２１は平面や曲面で構成され、保持部材４を押圧する押圧面となる。また、押圧治具は、例えば合成樹脂の成形体である。使用できる合成樹脂としては、例えば、ポリアミド（ＰＡ）樹脂、ポリカーボネート（ＰＣ）樹脂、ポリアセタール（ＰＯＭ）樹脂、ポリブチレンテレフタレート（ＰＢＴ）樹脂、ポリフェニレンサルファイド（ＰＰＳ）樹脂などが挙げられる。 In FIG. 5, each protrusion 82 has an asymmetrical shape in the axial cross section. Specifically, it has an inclined surface 821 that is inclined in one direction in the axial direction. The inclined surface 821 is formed of a flat surface or a curved surface, and serves as a pressing surface for pressing the holding member 4. The pressing jig is, for example, a molded body of synthetic resin. Examples of the synthetic resin that can be used include polyamide (PA) resin, polycarbonate (PC) resin, polyacetal (POM) resin, polybutylene terephthalate (PBT) resin, and polyphenylene sulfide (PPS) resin.

図６および図７を参照して、押圧治具を用いて管継手から管を取り外す方法を説明する。図６は、管継手に押圧治具を装着した状態を示し、図７は、押圧治具で保持部材を押圧した状態を示す。図６において、押圧治具８は、弾性変形により拡径してハウジング２の貫通孔２４に装着される。具体的には、押圧治具８の切欠部の開口幅を、貫通孔２４が形成されたハウジング２の円周部の外径よりも大きくなるまで拡げて、各突起８２を各貫通孔２４の位置に合わせて嵌め込むことで、押圧治具８が装着される。この場合、突起８２の傾斜面８２１が、挿入方向、つまり保持部材４を移動させる方向に向くように装着される。これにより、保持部材４のスムーズな移動が可能となる。 A method of removing the pipe from the pipe joint using a pressing jig will be described with reference to FIGS. 6 and 7. FIG. 6 shows a state in which the pressing jig is attached to the pipe joint, and FIG. 7 shows a state in which the holding member is pressed by the pressing jig. In FIG. 6, the pressing jig 8 is expanded in diameter by elastic deformation and mounted in the through hole 24 of the housing 2. Specifically, the opening width of the notch portion of the pressing jig 8 is widened until it becomes larger than the outer diameter of the circumferential portion of the housing 2 in which the through hole 24 is formed, and each protrusion 82 is formed in each through hole 24. The pressing jig 8 is attached by fitting it in accordance with the position. In this case, the inclined surface 821 of the protrusion 82 is mounted so as to face the insertion direction, that is, the direction in which the holding member 4 is moved. This enables smooth movement of the holding member 4.

押圧治具８を装着した状態から突起８２を径方向内側に押し込むことで、突起８２の傾斜面８２１と保持部材４のフランジ部４１が当接して、保持部材４が挿入方向に沿って移動する（図７参照）。つまり、傾斜面８２１が傾斜していることで、径方向への突起８２の押し込み動作によって、保持部材４が挿入方向に移動する。この場合、弾性部材６によって反挿入方向へ向かって押されている保持部材４および抜止部材５が、弾性部材６の付勢力に抗して挿入方向へ移動する。この移動によって、抜止部材５がスペーサ部材２２から離れ、管１１に対する抜止部材５の嵌まり合いが緩むことで、抜止部材５と管１１の係合が解除される。このとき、弾性部材６は圧縮された状態となっている。 By pushing the protrusion 82 inward in the radial direction from the state where the pressing jig 8 is attached, the inclined surface 821 of the protrusion 82 and the flange portion 41 of the holding member 4 come into contact with each other, and the holding member 4 moves along the insertion direction. (See FIG. 7). That is, since the inclined surface 821 is inclined, the holding member 4 moves in the insertion direction by the pushing operation of the protrusion 82 in the radial direction. In this case, the holding member 4 and the retaining member 5 pushed in the counter-insertion direction by the elastic member 6 move in the insertion direction against the urging force of the elastic member 6. By this movement, the retaining member 5 is separated from the spacer member 22, and the engagement of the retaining member 5 with respect to the pipe 11 is loosened, so that the engagement between the retaining member 5 and the pipe 11 is released. At this time, the elastic member 6 is in a compressed state.

抜止部材５の係合が解除された状態で、管１１に引き抜き力を作用させることで、径方向に移動可能になった抜止部材５を拡管部１２が乗りこえ、管継手１から管１１を取り外すことができる。 With the retaining member 5 disengaged, the pipe expanding portion 12 rides over the retaining member 5 that has become movable in the radial direction by applying a pulling force to the pipe 11, and the pipe 11 is removed from the pipe joint 1. be able to.

上記第１実施形態では、ハウジング２を、ハウジング本体２１とスペーサ部材２２の別部材で構成したが、これらを一部材（ハウジング本体のみ）で構成してもよい。この場合、ハウジング本体２１の挿入口側の内壁面を反挿入方向へ進むにしたがって縮径する傾斜面とし、その傾斜面に抜止部材が押し付けられる構成にしてもよい。 In the first embodiment, the housing 2 is composed of separate members of the housing body 21 and the spacer member 22, but these may be composed of one member (housing body only). In this case, the inner wall surface of the housing body 21 on the insertion port side may be an inclined surface whose diameter is reduced as it advances in the counter-insertion direction, and the retaining member may be pressed against the inclined surface.

本発明に係る管継手の第２実施形態を図８に基づいて説明する。図８は、管と接続された状態の管継手の片側断面図であり、上半分が断面図、下半分が側面図を表している。図８において、ハウジング２は、ハウジング本体２１と、ハウジング本体２１の一端部に固定されたナット状部材２５とを有する。ハウジング本体２１とナット状部材２５は、例えば、ハウジング本体２１の外周面に設けられたおねじ部と、ナット状部材２５の内周面に設けられためねじ部を螺合させることで固定される。 A second embodiment of the pipe joint according to the present invention will be described with reference to FIG. FIG. 8 is a one-sided cross-sectional view of a pipe joint connected to a pipe, with an upper half showing a cross-sectional view and a lower half showing a side view. In FIG. 8, the housing 2 has a housing main body 21 and a nut-shaped member 25 fixed to one end of the housing main body 21. The housing body 21 and the nut-shaped member 25 are fixed by, for example, screwing the male threaded portion provided on the outer peripheral surface of the housing body 21 and the threaded portion provided on the inner peripheral surface of the nut-shaped member 25. ..

ハウジング本体２１にはシールリング３が内蔵され、ナット状部材２５の内部には抜止部材５を保持した保持部材４が設けられている。保持部材４とハウジング本体２１との間には弾性部材６が配置されており、その弾性部材６によって、保持部材４および抜止部材５が反挿入方向へ向かって付勢されている。図８の接続状態では、抜止部材５の外周面５１１が傾斜面２５１に当接して、エッジ部５２１が拡管部１２の外周面に密接に係合している。これにより、管１１の抜け出しを防止できる。 A seal ring 3 is built in the housing main body 21, and a holding member 4 holding the retaining member 5 is provided inside the nut-shaped member 25. An elastic member 6 is arranged between the holding member 4 and the housing main body 21, and the elastic member 6 urges the holding member 4 and the retaining member 5 in the anti-insertion direction. In the connected state of FIG. 8, the outer peripheral surface 511 of the retaining member 5 is in contact with the inclined surface 251 and the edge portion 521 is closely engaged with the outer peripheral surface of the pipe expanding portion 12. As a result, it is possible to prevent the pipe 11 from coming off.

また、ナット状部材２５において、保持部材４の径方向外側には貫通孔２４が形成されている。貫通孔２４は、ナット状部材２５の周方向に間隔をあけて複数個（例えば、４個）設けられており、上述したような押圧治具の突起が嵌合可能となっている。図８の管継手１においても、貫通孔２４を介して、径方向外側から挿入方向に保持部材４を押圧することで、保持部材４および抜止部材５が挿入方向に沿って移動して、抜止部材５の係合を解除することができる。 Further, in the nut-shaped member 25, a through hole 24 is formed on the radial outer side of the holding member 4. A plurality of (for example, four) through holes 24 are provided at intervals in the circumferential direction of the nut-shaped member 25, and the protrusions of the pressing jig as described above can be fitted. Also in the pipe joint 1 of FIG. 8, by pressing the holding member 4 in the insertion direction from the outside in the radial direction through the through hole 24, the holding member 4 and the retaining member 5 move along the insertion direction to release the pipe joint 1. The engagement of the member 5 can be disengaged.

以上のように、第１実施形態および第２実施形態の管継手は、径方向外側から挿入方向に保持部材が押圧されて抜止部材の係合が解除される構成であるため、管の周囲が狭い空間などの場合でも管の取り外しを容易に行うことができる。一方、不意の接触や誤った操作などによって、意図せずに保持部材が押圧される場合も考えられる。そのような場合、抜止部材の係合が解除されて管が抜けてしまうおそれがある。 As described above, the pipe joints of the first embodiment and the second embodiment have a configuration in which the holding member is pressed from the outside in the radial direction in the insertion direction to disengage the retaining member, so that the circumference of the pipe is covered. The pipe can be easily removed even in a narrow space. On the other hand, it is also possible that the holding member is unintentionally pressed due to unexpected contact or erroneous operation. In such a case, the retaining member may be disengaged and the pipe may come off.

このような対処として、図９には、第３実施形態として、抜止部材の係合の解除をロックするロック機構を設けた管継手を示す。図９に示すように、管継手１のハウジング２は、ハウジング本体２１と、ハウジング本体２１の一端部に装着されたナット状部材２５とを有する。この管継手１は、図８の管継手と異なり、ナット状部材２５が、ハウジング本体２１に対してスライド可能に構成されており、ナット状部材２５がスライドされることによって保持部材４の移動が制限される。図９は、ナット状部材２５がスライドする前の状態を示し、図１０は、ナット状部材２５がスライドした後の状態を示す。 As such a countermeasure, FIG. 9 shows, as a third embodiment, a pipe joint provided with a lock mechanism for locking the disengagement of the retaining member. As shown in FIG. 9, the housing 2 of the pipe joint 1 has a housing main body 21 and a nut-shaped member 25 attached to one end of the housing main body 21. In this pipe joint 1, unlike the pipe joint of FIG. 8, the nut-shaped member 25 is configured to be slidable with respect to the housing body 21, and the holding member 4 can be moved by sliding the nut-shaped member 25. Be restricted. FIG. 9 shows a state before the nut-shaped member 25 slides, and FIG. 10 shows a state after the nut-shaped member 25 slides.

図９において、ナット状部材２５の内壁面に２条の内周溝２５２、２５３が形成されている。２条の円周溝のうち、挿入方向下流側が内周溝２５２で、挿入方向上流側が内周溝２５３である。止め輪９の一部がナット状部材２５の内周溝２５２に嵌入され、残りの一部がハウジング本体２１の外周溝に嵌入されることで、ハウジング本体２１とナット状部材２５とが結合されている。また、軸方向においてハウジング本体２１とナット状部材２５との間には隙間が設けられている。隙間はハウジング２の周方向に沿って形成されており、上記隙間にカラー１０が嵌め込まれている。図９の状態では、上記隙間にカラー１０が介在されているため、ナット状部材２５は挿入方向にスライドできない。つまり、カラー１０は、ナット状部材２５のスライドを規制する規制部材となっている。なお、図９の管継手１においても、貫通孔２４を介して保持部材４が押圧されることで、抜止部材５の係合の解除が可能である。 In FIG. 9, two inner peripheral grooves 252 and 253 are formed on the inner wall surface of the nut-shaped member 25. Of the two circumferential grooves, the downstream side in the insertion direction is the inner peripheral groove 252, and the upstream side in the insertion direction is the inner peripheral groove 253. A part of the retaining ring 9 is fitted into the inner peripheral groove 252 of the nut-shaped member 25, and the remaining part is fitted into the outer peripheral groove of the housing main body 21, so that the housing main body 21 and the nut-shaped member 25 are connected. ing. Further, a gap is provided between the housing body 21 and the nut-shaped member 25 in the axial direction. The gap is formed along the circumferential direction of the housing 2, and the collar 10 is fitted in the gap. In the state of FIG. 9, since the collar 10 is interposed in the gap, the nut-shaped member 25 cannot slide in the insertion direction. That is, the collar 10 is a regulating member that regulates the slide of the nut-shaped member 25. Also in the pipe joint 1 of FIG. 9, the engaging member 5 can be disengaged by pressing the holding member 4 through the through hole 24.

カラー１０は、図１１に示すように、隙間に嵌り込む略Ｃ字状の本体部１０１と、作業者に把持される把持部１０２とを有する。カラー１０は、例えば合成樹脂の成形体である。使用できる合成樹脂としては、例えば、ＰＡ樹脂、ＰＣ樹脂、ＰＯＭ樹脂、ＰＢＴ樹脂、ＰＰＳ樹脂などが挙げられる。 As shown in FIG. 11, the collar 10 has a substantially C-shaped main body portion 101 that fits into the gap, and a grip portion 102 that is gripped by an operator. Color 10 is, for example, a molded product of synthetic resin. Examples of the synthetic resin that can be used include PA resin, PC resin, POM resin, PBT resin, PPS resin and the like.

図９の状態から、カラー１０を引き抜き、ナット状部材２５を挿入方向へ押し込んでいくと、止め輪９は、内周溝２５２の傾斜面（反挿入方向側の側壁面）に沿って移動して、ハウジング本体２１の外周溝に押し込まれる。その後、止め輪９がナット状部材２５の内周溝２５３に嵌まり込む（図１０参照）。 When the collar 10 is pulled out from the state of FIG. 9 and the nut-shaped member 25 is pushed in the insertion direction, the retaining ring 9 moves along the inclined surface (side wall surface on the opposite side of the insertion direction) of the inner peripheral groove 252. Is pushed into the outer peripheral groove of the housing body 21. After that, the retaining ring 9 is fitted into the inner peripheral groove 253 of the nut-shaped member 25 (see FIG. 10).

図１０に示すように、ナット状部材２５がスライドした状態では、弾性部材６はハウジング２と保持部材４との間で圧縮されている。つまり、弾性部材６の圧縮代が小さくなることで、保持部材４の移動ストロークが小さくなる。その結果、この状態で保持部材４が押圧されたとしても、保持部材４の移動が制限され、抜止部材５の係合が維持される。なお、図１０では、弾性部材６が完全に圧縮されており、保持部材４が移動不可となっているが、このロック機構は、抜止部材５の係合が維持される程度に保持部材４の移動が制限される構成であればよい。 As shown in FIG. 10, when the nut-shaped member 25 is slid, the elastic member 6 is compressed between the housing 2 and the holding member 4. That is, as the compression allowance of the elastic member 6 becomes smaller, the moving stroke of the holding member 4 becomes smaller. As a result, even if the holding member 4 is pressed in this state, the movement of the holding member 4 is restricted and the engagement of the retaining member 5 is maintained. In FIG. 10, the elastic member 6 is completely compressed and the holding member 4 is immovable. However, the locking mechanism of the holding member 4 is such that the engagement of the retaining member 5 is maintained. Any configuration may be used as long as the movement is restricted.

このように、図１０の管継手１は、ナット状部材２５をハウジング本体２１に対して挿入方向へスライド可能に構成することで、スライド前の状態では押圧による管１１の取り外しを可能としつつ、スライド後の状態では意図しない押圧による管の抜け出しを防止することができる。 As described above, in the pipe joint 1 of FIG. 10, the nut-shaped member 25 is configured to be slidable with respect to the housing body 21 in the insertion direction, so that the pipe 11 can be removed by pressing in the state before the slide. In the state after sliding, it is possible to prevent the tube from coming out due to unintended pressing.

上記各実施形態では、管継手に接続される管として、管端部に拡管部が形成された管を用いたが、これに限定されない。例えば、拡管部がなく外径が一定の管を用いることもできる。また、ステンレス鋼管以外にも、樹脂製の管も使用可能である。 In each of the above embodiments, as the pipe connected to the pipe joint, a pipe having a pipe expansion portion formed at the pipe end is used, but the pipe is not limited to this. For example, a pipe having no expansion portion and having a constant outer diameter can be used. In addition to stainless steel pipes, resin pipes can also be used.

また、上記各実施形態では、略円筒状のハウジングの一端部を挿入口として、一方側から管が挿入される形態を示したが、ハウジングの両側から管が挿入される形態であってもよい。また、ハウジングを有底円筒状にして、ハウジングの一端部を挿入口とし、他端部を閉塞させてもよい。このような構成の管継手は、例えば、水圧試験用のキャップとして使用される。鉄道沿線などの長い配管施工を行う場合、区間ごとの水圧試験が必要であり、その都度、末端部の管にキャップの取り付け、取り外しを行うことになるが、本発明に係る管継手をそのキャップとして使用することで取り付け、取り外しが容易となり、作業の効率化を図ることができる。 Further, in each of the above embodiments, the tube is inserted from one side with one end of the substantially cylindrical housing as the insertion port, but the tube may be inserted from both sides of the housing. .. Further, the housing may have a bottomed cylindrical shape, one end of the housing may be used as an insertion port, and the other end may be closed. A pipe joint having such a structure is used, for example, as a cap for a water pressure test. When performing long piping construction along railway lines, a water pressure test is required for each section, and each time a cap is attached to or removed from the pipe at the end, the pipe joint according to the present invention is used as the cap. By using it as a device, it can be easily attached and detached, and work efficiency can be improved.

本発明の管継手は、管の抜け出しを防止するとともに、管周囲が狭い空間などの場合でも管を容易に取り外すことができるので、管継手に広く使用でき、特に、メンテナンスや交換などの再施工が頻繁な配管における管継手に適している。 The pipe joint of the present invention can be widely used for pipe joints because it prevents the pipe from coming off and the pipe can be easily removed even in a narrow space around the pipe. Is suitable for pipe fittings in frequent piping.

１：管継手
２：ハウジング
２１：ハウジング本体
２１１：円周溝
２２：スペーサ部材
２２１：傾斜面
２３：挿入口
２４：貫通孔
２５：ナット状部材
２５１：傾斜面
２５２：内周溝
２５３：内周溝
３：シールリング
３１：リップ部
４：保持部材
４１：フランジ部
４２：保持片
４２１：円周溝
４３：保持溝
４４：係止部
５：抜止部材
５１：山形部
５１１：外周面
５２：狭着部
５２１：エッジ部
６：弾性部材
７：止め輪
８：押圧治具
８１：リング本体
８２：突起
８２１：傾斜面
８３：切欠部
９：止め輪
１０：カラー
１０１：カラー本体部
１０２：把持部
１１：管
１２：拡管部 1: Pipe fitting 2: Housing 21: Housing body 211: Circumferential groove 22: Spacer member 221: Inclined surface 23: Insertion port 24: Through hole 25: Nut-shaped member 251: Inclined surface 252: Inner peripheral groove 253: Inner circumference Groove 3: Seal ring 31: Lip part 4: Holding member 41: Flange part 42: Holding piece 421: Circumferential groove 43: Holding groove 44: Locking part 5: Retaining member 51: Crest part 511: Outer peripheral surface 52: Narrow Fitting part 521: Edge part 6: Elastic member 7: Stop ring 8: Pressing jig 81: Ring body 82: Protrusion 821: Inclined surface 83: Notch 9: Stop ring 10: Collar 101: Color body 102: Gripping part 11: Pipe 12: Pipe expansion part

Claims

少なくとも一端部から管が挿入され、前記管の外周面に密着するシール部材が内蔵された略円筒状のハウジングを備え、前記ハウジング内において、前記一端部から前記管の挿入方向へ向かって、前記管の外周面に係合される抜止部材を保持する保持部材と、前記保持部材および前記抜止部材を反挿入方向へ向かって付勢する弾性部材とが配置された管継手であって、
前記保持部材の径方向外側に前記ハウジングの内外を径方向に貫通する貫通孔が形成されており、
前記管と接続された状態において、前記貫通孔を介して前記保持部材が径方向外側から挿入方向に押圧されることで、前記保持部材および前記抜止部材が前記弾性部材の付勢力に抗して移動して、前記抜止部材と前記管の係合が解除されることを特徴とする管継手。 A substantially cylindrical housing in which a pipe is inserted from at least one end and a sealing member in close contact with the outer peripheral surface of the pipe is provided, and the pipe is inserted from the one end toward the insertion direction of the pipe in the housing. A pipe joint in which a holding member for holding a retaining member engaged with the outer peripheral surface of the pipe and an elastic member for urging the holding member and the retaining member in a counter-insertion direction are arranged.
A through hole is formed on the outer side of the holding member in the radial direction to penetrate the inside and outside of the housing in the radial direction.
In the state of being connected to the pipe, the holding member is pressed from the outside in the radial direction in the insertion direction through the through hole, so that the holding member and the retaining member resist the urging force of the elastic member. A pipe joint characterized in that the engagement between the retaining member and the pipe is disengaged by moving.

前記保持部材は略リング状部材であり、前記貫通孔は、前記保持部材の径方向外側であって、かつ、前記ハウジングの周方向に間隔をあけて複数個形成されていることを特徴とする請求項１に記載の管継手。 The holding member is a substantially ring-shaped member, and a plurality of through holes are formed on the outer side in the radial direction of the holding member and at intervals in the circumferential direction of the housing. The pipe fitting according to claim 1.

前記ハウジングは、前記シール部材が内蔵されたハウジング本体と、該ハウジング本体の一端部に装着されたナット状部材とで構成され、前記ナット状部材に前記貫通孔が形成され、該貫通孔の内側に前記保持部材が設けられており、
前記保持部材と前記ハウジング本体との間に前記弾性部材が配置されていることを特徴とする請求項１または請求項２に記載の管継手。 The housing is composed of a housing body in which the seal member is built and a nut-shaped member mounted on one end of the housing body, and the nut-shaped member is formed with the through hole, and the inside of the through hole is formed. The holding member is provided in the housing.
The pipe joint according to claim 1 or 2, wherein the elastic member is arranged between the holding member and the housing body.

前記ナット状部材は、前記ハウジング本体に対して前記挿入方向にスライド可能に装着されており、前記ナット状部材を前記挿入方向にスライドさせることで、前記弾性部材が圧縮され、前記保持部材の移動が制限されることを特徴とする請求項３に記載の管継手。 The nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed and the holding member moves. The pipe fitting according to claim 3, wherein the number of joints is limited.

前記管継手は、前記保持部材を押圧するための押圧治具をさらに備え、
前記押圧治具は、周方向の一部に切欠部を有する略リング状部材であり、その内周面に、前記貫通孔に挿通可能な突起が形成されていることを特徴とする請求項１から請求項４までのいずれか１項に記載の管継手。 The pipe joint further includes a pressing jig for pressing the holding member.
The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and is characterized in that a protrusion that can be inserted into the through hole is formed on the inner peripheral surface thereof. The pipe fitting according to any one of claims 4 to 4.

前記押圧治具の前記突起は、軸方向の一方向に向かって傾斜した傾斜面を有しており、前記傾斜面が前記保持部材に当接されて押圧されることを特徴とする請求項５に記載の管継手。 5. The protrusion of the pressing jig has an inclined surface inclined in one direction in the axial direction, and the inclined surface is brought into contact with the holding member and pressed. The pipe fitting described in.

押圧治具を用いて、管継手から管を取り外す管の取り外し方法であって、
前記管継手は、少なくとも一端部から管が挿入され、前記管の外周面に密着するシール部材が内蔵された略円筒状のハウジングを備え、前記ハウジング内において、前記一端部から前記管の挿入方向へ向かって、前記管の外周面に係合される抜止部材を保持する保持部材と、前記保持部材および前記抜止部材を反挿入方向へ向かって付勢する弾性部材とが配置され、前記保持部材の径方向外側に前記ハウジングの内外を径方向に貫通する貫通孔が形成されており、
前記押圧治具は、周方向の一部に切欠部を有する略リング状部材であり、その内周面に、前記貫通孔に挿通可能な突起が形成されており、
前記管の取り外し方法は、前記管継手と前記管とが接続された状態において、前記押圧治具を拡径させて、前記突起が前記ハウジングの貫通孔に嵌合するように前記押圧治具を装着する装着工程と、装着された前記押圧治具の前記突起を径方向内側に押圧して、前記保持部材および前記抜止部材を前記弾性部材の付勢力に抗して移動させる押圧工程と、前記押圧工程によって前記抜止部材との係合が解除された前記管を引き抜く引き抜き工程を有することを特徴とする管の取り外し方法。 A method of removing a pipe from a pipe joint using a pressing jig.
The pipe joint includes a substantially cylindrical housing in which a pipe is inserted from at least one end and a sealing member that is in close contact with the outer peripheral surface of the pipe is incorporated, and the pipe is inserted from the one end in the housing. A holding member for holding the retaining member engaged with the outer peripheral surface of the pipe and an elastic member for urging the holding member and the retaining member in the anti-insertion direction are arranged toward the direction of the holding member. A through hole that penetrates the inside and outside of the housing in the radial direction is formed on the outer side in the radial direction of the housing.
The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a protrusion that can be inserted into the through hole is formed on the inner peripheral surface thereof.
The method for removing the pipe is to expand the diameter of the pressing jig in a state where the pipe joint and the pipe are connected, and to fit the pressing jig into the through hole of the housing. The mounting step of mounting, the pressing step of pressing the protrusion of the mounted pressing jig inward in the radial direction to move the holding member and the retaining member against the urging force of the elastic member, and the above. A method for removing a pipe, which comprises a pulling step of pulling out the pipe whose engagement with the retaining member has been released by a pressing step.